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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 13 |
| 6 | 59 |
| 7 | 3324 |
| 8 | 890065 |
| 9 | 166683166499 |
| 10 | 39725939269090918399 |
| 11 | 1240040687243304530118746458657221560 |
| 12 | 11740660815927242416329935330676365456512664243108711550072429939 |
[1,1,1,2,3,13,59,3324,890065,166683166499, 39725939269090918399, 1240040687243304530118746458657221560, 11740660815927242416329935330676365456512664243108\ 711550072429939] |